After much development effort and plenty of beta testing,
version 0.4 of SQLAlchemy is released. For
those who haven't been following along, this release represents
several months of refactorings, rewrites, API reorganizations,
and re-documenting of virtually every area of SQLAlchemy's
functionality. A handful of core developers and dozens of
contributors have helped this release to broadly address many
areas, including:

major code simplifications and optimizations within the SQL
expression API, execution system, and ORM